    import {mapGetters} from 'vuex'
    export default {
        computed:{
          ...mapGetters('m_cart', ['total']),  
        },
        watch:{
            total(){
                this.setBadge()
            }
        },
        onShow() {
            this.setBadge()
        },
        methods:{
            setBadge() {
                uni.setTabBarBadge({
                    index:2,
                    text:this.total === 0 ? 0 : this.total + '',
                })
            }
        }
    }